Filter for downtrend

Hello, can someone help me create a filter :
– which starts when a condition appears
– which ends when another condition occurs.

This filter will be included in a robot and will be used to take sales on a lower TF.

The filter starts when :
– the SMA7 > SMA20 AND the SMA7 turns down,

The filter disappears when :
– the SMA7 turns upwards

I tried to create a code to accept trades only between these conditions but it doesn’t seem to work the way I want it to.

Using graph it only shows the first condition and I can’t create an indicator that could color the background (with backgroundcolor) so I don’t realize where the error comes from.

Maybe you should use a While loop but I haven’t found the solution.
Here is the code:

defparam cumulateorders = false


SMA7 = Average[7](close)
SMA20 = Average[20](close

timeframe(daily)


// ***************** FILTER START *******

//  SMA7 > SMA20 
C1 = (SMA7 > SMA20) 

//  Downtrend start
C2 = (SMA7[1] > SMA7[2]) AND (SMA7[1] > SMA7)


// ***************** END OF FILTER *******

//  End of Downtrendown
C3 = (SMA7[1] < SMA7[2]) AND (SMA7[1] < SMA7)

// ***************** 

FILTERSTART = C1 AND C2

ENDofFILTER = C3

ONCE TradeOn = 0


IF FILTERSTART AND Not OnMarket THEN
TRADEON = 1
Endif

IF (TradeOn = 1) AND ENDofFILTER THEN
TradeON = 0
ENDIF


timeframe(default)

// Engulfing
c4 = high>high[1] and close < low[1]

ConditionsSell =  (TradeOn = 1) AND C4

IF NOT ShortOnMarket AND ConditionsSell  THEN
SELLSHORT 1 CONTRACTS AT MARKET
ENDIF

SET TARGET pPROFIT 50
SET STOP pLOSS 20

Filter-SMA7_SMA20.png